28 Jul
2006
28 Jul
'06
8:55 a.m.
------------Original Message:
From: "Ethan Dicks" <ethan.dicks at
gmail.com>
Subject: Re: Parallel ASCII keyboards
On 7/28/06, M H Stein <dm561 at torfree.net> wrote:
> --------------Original Message:
> From: "Ethan Dicks" <ethan.dicks at gmail.com>
> Subject: Re: Parallel ASCII keyboards
>
> <snip>
> My recollection is that the mid-1970s were the heyday of ASCII
> keyboards (AIM-65 and similar machines).
> <snip>
> ---------------Reply:
> ASCII keyboard on an AIM65??? Not on any of mine...
I have to admit that I've never dug into the AIM-65
ROMs, so if not
ASCII, then just scan codes that get converted in software?
-ethan
-----------Reply:
Just a scanned matrix, as mentioned elsewhere, nothing on the
keyboard except the switches; guess your AIMs aren't exactly handy
at the moment :).
The -40 did have a parallel ASCII display unit and a Centronics-interface
printer, but its keyboard was still a scanned matrix.
mike
29 Jul
29 Jul
10:15 a.m.
Hi
Intel series II used a parallel keyboard.
I use a keyboard on my Poly8813 that came from a Franklin. It
was purchase as new-old-stock from ebay. I'd gotten two but passed
one on to another. It is nice because it runs on a 8048 controller
and all is in an eprom that can have the tables changed. I needed
a character that wasn't in the table as a control key. I just editied
the table and changed the eprom.
Dwight
10:42 a.m.
When I first used my SWTP TV Typewriter, I adapted a keyboard from a piece
of (IIRC) RCA gear (it may have been Spectra 70 related). The original TVT
keyboard was a piece of junk.
Output was EBCDIC and encoding was done with a diode matrix and some DTL.
I was able to rework the encoding matrix so that the keyboard produced
mostly ASCII. It was a wonderful keyboard--made by George Risk and had
individual pressure-calibrated sealed reed switches for the keys (function
keys were set to have a higher activation pressure than alphanumerics). It
was enclosed in a diecast housing.
I wish I would have hung onto it--it was a great keyboard. They don't
build 'em like that anymore.
Cheers,
Chuck
7291
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